Image:
Masked Threefin, Enneapterygius similis

Notes

Males can be recognised by the dark-coloured posterior half of the body and densely dotted head and 'chest'. Females are greyish green with pinkish scale margins and a dark bar crossing the interorbital (faint in image). They have white bars dorsally on the body that often end in a spot on the lateral line.

The species name 'similis' refers to the similarity in colour and habitat of this species to Enneapterygius hemimelas.

Reference:
Randall, J.E. 2005. Reef and Shore Fishes of the South Pacific. University of Hawai'i Press. Pp. 707.